Natural Gas Processing

3.6. Two-phase flow pressure drop

The formula for calculating the pressure drop for two-phase fluids in pipes is analogous to the equivalent single-phase flow version shown in Eqn (3.19), except that the friction factor and physical properties are replaced by their two-phase equivalents:

$- \frac{ⅆ P}{ⅆ L} = \frac{g}{g_{c}} ρ_{M} \sin θ + \frac{f_{M} ρ_{M} v_{M}^{2}}{2 g_{c} d_{i}} + \frac{ρ_{M} v_{M} ⅆ v_{M}}{g_{c} d_{L}}$

(3.68)

The pressure loss term in Eqn (3.34) includes a two-phase friction factor, f_M. In the past, researchers have spent much effort in developing predictive correlations for the two-phase friction factor, as well as the slip liquid holdup term.

Definitions of the mixture density (ρ_m) and mixture friction factor (f_m) terms ...

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Natural Gas Processing by Alireza Bahadori

3.6. Two-phase flow pressure drop

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